Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dae94aa68a069b6…

MALICIOUS

PDF

83.9 KB Created: 2021-03-08 06:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 747aebd63f74e03ea1277676d183df49 SHA-1: d56028db27ca556662161c465d2270b56180b86f SHA-256: 6dae94aa68a069b62efcf69d954f69eda3fe4a81972798b5ef734fbac83f9a68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=innova+3160+manual+en+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/navotezive/Ijf7ic0/77678684592.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/cQn9Qih/lutuzagiserimitinapedoko.pdfIn PDF document text
    • http://xtina.online/bacterias_fermentadoras_de_lactosarj1cm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_604111979cc2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455178/normal_5fdfeff96a2cd.pdfIn PDF document text
    • https://cdn.sqhk.co/besimiwi/ifcN4jb/golden_goal_sports_complex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_5fe80b1656c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_60158a0d86f95.pdfIn PDF document text
    • http://starkrobotics.org/swiftshader_3.0_download_2shared2yfq0.pdfIn PDF document text
    • http://fajamad.mypressonline.com/15071104191.pdfIn PDF document text
    • http://vnatural.space/piboretogipesugerojowa3b9w2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464873/normal_603a83d243f3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_a1d6e70661764e48895bc00a736ee1ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/79581760226.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_10d0b56166d7423cb1225d16fcaddd93.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_7d94b426e48e45db8b1160685543625d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/kudinusinamijadezuzige.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/38738355503.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/list_of_regular_verbs_in_english_with_spanish_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/astrocytoma_glioblastoma_multiforme.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/56802849283.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/all_you_need_to_know_about_the_music_business_ninth_edition_audiobook.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_a5d463303376412f97c8b6b0aaa778cc.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_c5c4233ad4bd469fb3e4c7820a05f033.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 5588 bytes
SHA-256: 54ea8e29827fc2a03fd5546c9012a4cf0add98460a3ee74405f0e5cb03a06353
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 11224 bytes
SHA-256: f5cf03a77f4aa3ee8905733d59aef1f756993f5a151333230e7acee4f3999e9f
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 20828 bytes
SHA-256: 55c6020fd129e2cd509ef27ebf8bed0487d65de3465948551e34cfab824334ab